Illuminating device



Oct. 8, 1929.

C. W. WYMAN ILLUMINATING DEVICE Filed June 20, 1927 lmzenZor:

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Patented Oct. 8, 1929 UNITED STATES CHARLES W. WYKAN, 01F CLABEIONT, NEW KAMBSHIBE, ASSIGNOR 'IO SULLIVAN" PA'ltENr OFFICE MACHINERY COIPANY,-A CORPORATION OF MASSACHUSETTS 'mmmms'rme nnvrcn Application filed June 20,1927. Serial No. 200,267. r

10 fully appear.

In the accompanying drawings I have shown for'purposes of illustration one form which myinvention may assume in practice.

In thesedrawings,-

Fig. 1 is a front elevation view of. my improved head light, parts being broken away to facilitate illustration.

Fig. 2 is a central vertical section on the line 22 of Fig. 1.

2o Fig. 3 is a plan view of my device shown in one extreme position in dotted lines.

Fig. 4. is a fragmentary vertical sectional su1table source of supply through apertures view through a portion of Fig. 2.

Fig. 5 is a horizontal section on the line In the illustrative form of my invention I have shown the head light, generally desi nated by the numeral 1, mounted on a suitab e support 2 whichmay be, for example, a part tached to the support 2 by suitable retaining means such as'stllds 4, and this bearing member has a horizontal bearing surface '5' on head light casing 6 has a screw threaded bore 7 adapted to receive a lens retaining member 8 for holding a lens 9 in a well known manner. The retaining member 8 has transverse ribs 10 providing protection for the lens and other parts of the lamp asis usual ractice in lights.

' 2and 4. A suitable adjusting screw. 18 is.

of a mining machine casing or a locomotive frame. A bearmg member 3 is rigidly atwhich the weight of the head light rests. The

provided for holding the bulb in any adjusted position.

At this point it should be noted that all of i which tends to pass through the joint and thus extinguishes the same. The terms flame proof and explosion proof as used herein to describe a joint, denote a joint of the character above mentioned or its equivalent, andas applied to a casing, mean a casing all of whose joints are of such character.

Power c'onducting wires 19 lead from any 20 in the supporting base 2. For the purpose of making the. connection between the wires 19 and apertures 20 explosion-proof, suitable adjustable, two-part biishings 21 are provided, which bushings may be held in place by any suitable retaining bolts 22." In this instance the bolts 22 themselves serve as the conductors "through the bushings. Into the bottom of the lamp casing (i/iS screw threaded a suitable flanged journal member 23 and this bushing may be locked to the casing by a small set screw 24. Bearin member 23 has a cylindrical portion 25 cibsely fitting in a; corresponding portion of the bearing member 3 and has aflan' e 26 engaging under a shoulder' 27 on the bearing member to hold'the head light agins't any possible vertical displacement. best shown in Fig. 5,

a notch 28 is provided in the periphery of the flange 26 extending around the circumference' of the same approximately one hundredeighty'degrees. Obviously this notch may be madefof greater or'lesser extent according to the maximu adjustment desired. A small screw 29. attached to the bearing member cooperates with the notch 28 for theangular movement between the .2 v a A i V journal member 23 and the bearing member 3. Any desired number of notches 30 may be formed member 3and a spring detent member 31 attached to the casing 6 may be provided to cooperate with the notches 30 and hold the headlight in angularly adjusted position relative to the bearing member 3 and the support. It'will beapparent from the drawings is made so as to be rotatable on a vertical axisand atthe'same time there is no danger V ,of an explosion inside the lamp casing being J cally described one from transmitted to the outsideatmosphere.

While "I have in this application specifiwhich my invention may assume in practice, it will-be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various forms of the same without departing from its spirit or the scope ofthe appended claims;

-What-I claim'as new and desire to secure by Letters Patent is:

1.In combination, a support, a bearing member attached to said support, a head light mounted-- thereon having an explosion-proof .casing with a journal portion received in said bearing member so that said light is -normally'free to be swung relative to said support, said lamp casing and journal member being rotatable said bearing" member on a vertical axis, means for limiting said rota movement, and means for locking the light in angularly usted position, the bearing surfaces on said journal member and said bearing member being in continuous contact over a relatively wide area completely around the 1 axls of pivotal movement so as to prevent the passage of any flame therethrough.

2. Inv combination, a machine frame presenting a support, an electric lighting device mounted thereon for limited pivotal movement, said'device having an explosion-proof casing with an opening support, power conducting wires extending through an explosion-proof joint between saidwires and said support, including a bushing surrounding one of said wires and in close contact therewith, said bushing fitting in a hole in said support, and means comprising relatively wide surfaces of revolution contacting throughout with each other during pivotal movement; forproviding an explosion-proof joint between relatively movable portions of said casing and said support duringv pivotal movement of said device. p

on the outside of the bearing therein adjacent said said opening, an adjustable bulb. mounted in said casing, means for providing;

greases 3. In combination, a machine frame presenting a support, an illuminating device having 'a'casing with a hollow interior, said casing being made up of sections having cooperating means to provide flame proof joints therebetween, said casing also having anopening therein, power conducting wires extending through said opening, a member surrounding said opening and forming a connection between said casing and support, means for securing said member to said support, means on said member to form a flame proof joint with said support when fixed thereto, said casing being freely rotatable" relative to said member, and means providing a flame proof joint between said casing and member comprising angularly related surfaces .on said member and onsaid casing completely surrounding said opening and contiguous to each other in any relative position ofsaid casing and member.

4. In combination, a machine frame presenting a support, anilluminating devicehaving a eating with a hollow interior, said casing being made up of sections having cooperating means to provide flame proof joints therebetween, said casing also having an opening therein, power conducting wires extending through said opening, a member surrounding said opening and forming a connection between said casing and support, means for securing said member to said support, means on said member to proof joint with said support when fixed thereto, said casingbeing freely rotatable relative to said member, means providing a flame proof joint between said casing and member comprising angularly related surfaces on said member and on said casing com: pletely surrounding said opening and-con- 'tiguous to each other in any relative position of said casing and member, and means providing an interlocking connection between said movable casing and said stationary memher to prevent removal of the device from said support without removal of said member.

5. In combination, a machine frame presenting a support, an illuminating device having a casing with casing being made up of sections having cooperating means to provide flame proof joints therebetween, -said casing also having an opening therein, power conducting wires extending through said opening, ried by. said support-to provide a bearing for rotatably receiving said casing, and means providing a flame proof joint between said casing and support'comprising angularly related surfaces on said member and said casing completely surrounding said opening and contiguous to each other in any relative position of said casing and support. a

6. -In combination, a machine frame presenting a support, an explosion proof head light asing mounted thereon for normally form a flame means car- CERTIFICATE or CORRECTION.

Patent No. 1,730,836.

Granted October 8, 1929, to

CHARLES W. WYMAN.

It is hereby certified that error appears in the prin above numbered patent requiring correction as follows: article "the" first occurrence read "them"; page word "support" strike out the comma; and that the said Letters Patent should be read with these-corrections therein that the same may conform to the record of the case in the Patent Office.

2, lin

Signed and sealed this-3rd day of December, A. D. 1929;

(Seal) M. J. Moore,

Acting Commissioner of Patents;

ted specification of the Page 1, line 64, for the e 56, claim 2, after the 

